Because of this combination of skills / perks
[u]Arcane spirt +divine order[/u] : this combination gives you 80-90% of the bar filled in both armor and recovery( reduses agility to about 15-20%
[u]energy drain[/u]: normally only reduses your grenade cool down but is augmented by other abilities.
[u]Embrace the void[/u]: where it starts to get fun. Damaging enemy's with your grenade / nova bomb triggers energy drain
[u]life steal[/u] killing a enemy while energy drain is active restores a " significant portion " if your health.
[u]the hunger [/u] extends the duration of energy drain
With these abilities you should be able to tank very well
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Not compared to the titan's defender class. Not by a long shot. The defender drops a shield that gives him and his buddies who pass through shields. His melee if killing a person grants him a shield. That one can be modified to charge continually AND have even more resistance to damage. Plus the standard armor passives and the ability to make his super charge more often he gets shields more often. He also can supress other supers with a grenade. So no. Any class can be some what tanky. But the titan is the king of it.